TREX CO INC — Director's Dealing 2011

Apr 5, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TREX CO INC (TREX)
CIK: 0001069878
Period of Report: 2011-04-01

Reporting Person: KAPLAN RONALD W (Director, President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-04-01	Common Stock	M	16173	$8.80	Acquired	134848	Direct
2011-04-01	Common Stock	D	4270	$33.33	Disposed	130578	Direct
2011-04-01	Common Stock	F	5025	$33.33	Disposed	125553	Direct
2011-04-01	Common Stock	S	100	$32.80	Disposed	125453	Direct
2011-04-01	Common Stock	S	100	$32.82	Disposed	125353	Direct
2011-04-01	Common Stock	S	100	$32.84	Disposed	125253	Direct
2011-04-01	Common Stock	S	200	$32.86	Disposed	125053	Direct
2011-04-01	Common Stock	S	100	$32.88	Disposed	124953	Direct
2011-04-01	Common Stock	S	417	$32.90	Disposed	124536	Direct
2011-04-01	Common Stock	S	100	$32.93	Disposed	124436	Direct
2011-04-01	Common Stock	S	100	$32.96	Disposed	124336	Direct
2011-04-04	Common Stock	S	1040	$33.16	Disposed	123296	Direct
2011-04-04	Common Stock	S	460	$33.17	Disposed	122836	Direct
2011-04-04	Common Stock	S	17	$33.175	Disposed	122819	Direct
2011-04-04	Common Stock	S	600	$33.18	Disposed	122219	Direct
2011-04-04	Common Stock	S	200	$33.185	Disposed	122019	Direct
2011-04-04	Common Stock	S	500	$33.19	Disposed	121519	Direct
2011-04-04	Common Stock	S	100	$33.1925	Disposed	121419	Direct
2011-04-04	Common Stock	S	200	$33.20	Disposed	121219	Direct
2011-04-04	Common Stock	S	100	$33.21	Disposed	121119	Direct
2011-04-04	Common Stock	S	483	$33.22	Disposed	120636	Direct
2011-04-04	Common Stock	S	100	$33.2325	Disposed	120536	Direct
2011-04-04	Common Stock	S	2173	$33.24	Disposed	118363	Direct
2011-04-04	Common Stock	S	100	$33.245	Disposed	118263	Direct
2011-04-04	Common Stock	S	300	$33.2475	Disposed	117963	Direct
2011-04-04	Common Stock	S	200	$33.249	Disposed	117763	Direct
2011-04-04	Common Stock	S	305	$33.25	Disposed	117458	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-04-01	Stock Appreciation Right	$8.80	M	16173	Disposed	2018-01-07	Common Stock (16173)	Direct

Footnotes

F1: 16,173 Stock Appreciation Rights (SARs) are being exercised pursuant to Rule 10b5-1 trading plan adopted by the reporting person on November 3, 2010.

F2: 5,025 shares are being surrendered as allowed by the Company's 2005 Stock Incentive Plan to cover the payment of taxes currently due on the exercise of SARs.

F3: The stock appreciation right becomes exerciseable in three equal installments beginning on the first anniversary date of the transaction date.

F4: The sales reported in this Form 4 were effected pursuant to Rule 10b5-1 trading plan adopted by the reporting person on November 3, 2010.